Sebambam

New swap, new problems
6.0LS NA very simple

1s start went well, after shutting her down = No Start

i can see there is no RPM signal
= Crank or cam sensor issue
It also doesnt got to SYNC

its ONLYshows STALL RPM

so no ignition and fuel

i swapped out 3 different crank sensors (OEM AC DELCO) and 2 cam sensors.
while swapping to a used OEM crank sensor, she started fine and i thought i got it solved.

all LEDs are fine Green and green/blue NO REDs

NAHHHHHH , again ...after shutdown = No Start same Failure = NO RPM , STALL RPM

has anybody had that issue?

It seems to not sync at all?

i wonder how this can happen after it ran fine 2x for 10 mins.

TrendSetter

Check your grounds. Make sure they’re all tight.

Sebambam

grounds are confirmed

Sebambam

ey guys

after going through everything with HOLLEY Tech Support and eliminating all weird possibilities, after

4 different CRANK SENSORs ( all checked out good ) turning off the Cam sensor
confirming the wiring is correct and working.

there is a high possibility that it is the actual ECU.
holley send me a label to return it and repair/ replace it.

rmike06

i have the same issue going on with a 6.0 swap. if you figure it out let me know. im thinking either reluctor wheel or ecu.

Sebambam

have you changed the crank sensor to a OEM ?

cam sensor and crank sensor are usually "syncing"

if you turn the cam off and you still have a no start + you meassure the 3 wires on the sensor ( top = purple, middle =black bottom = red) set the voltmeter ground on the middle black one.. tehn the red one shoudl be arround +- 12V that means the harness is ok.

then its a high possibility the ECU is bad.

Holley sent me a label to send it in for repair .

Sebambam

UPDATE:
holley tested the ECU and said its fine... so now im dead in the water....

its on its way back , i will put int one more NEW GM CRANK SENSOR

WHAT ELSE HAVE YOU GUYS DONE/ FOUND??

i will go back in and add another Ground Probable from the BLOCK to the Frame since the block is painted i will look into that just to be sure.

TrendSetter

Most of these sorts of problems end up being ground related.
Id suggest running a good ground from block to battery.
like you said, clean metal, no paint. Hold the wire in one hand and crimped end in the other. If you can pull the end off(don’t be shy), it wasn’t crimped correctly.

it ran at one point so it’s configured right/close enough.
with rfi problems it would probably still at least start.

there’s another recent thread here with folks far more experienced than me that have come across this sort of thing and never resolved it using stock pickups, they used an external crank trigger.

Sebambam

I agree.
I have a 0 gauge running from the front of the head to the frame.
I will either add or relocate it so it is block to frame

TrendSetter

the frame isnt the battery. how is the battery connected to the frame?

LilJayV10

iTrader: (39)

Are the power and ground from the ECU going straight to the battery?

Sebambam

Sorry to be clear

0 Gauge from front of head to a Stud welded on the frame
+ Battery 0 Gauge to the Stud on the frame

Sebambam

YES confirmed!

Sebambam

Guys its not my 1st Term X build but the 1st one giving me such headaches...

LilJayV10

iTrader: (39)

sorry man I have to ask the normal BASIC questions. It's unbelievable what some people do then blame Holley.

I didn't mean to offend you. I apologize if I did.

Sebambam

No worries
this annoys me as well and i feel like aidot

i added a 0gauge ground wire BAT to the BLOCK( ORANGE)
I have a 0gauge ground from HEad ( yellow ) to a stud on the frame ( yellow)
the a ) gaue from Battery (green) to the STud on the frame ( green)

i confirmed the back of the head ground and added electrical grease just becuase
i put in another GM CRANK sensor
i put in a new CAM sensor

Crank LED is blinking blue/green @ cranking
CAM sensor stays BLUE = Gap detected so the Holley LED Manual

im dead in the water..






i have as a result of NO RPM = No Spark No fuel to injectors

LilJayV10

iTrader: (39)

Do you have access to an oscilloscope?

I'd scope the crank/cam signals at the ECU.

Sebambam

no i dont have one sorry..

Sebambam

Question whaould the MAP ensor effect the starting ?
i i have a GM external 1bar style ...

I select LS1/LS5 Styl MAP 1bar in the terminator X??

i dont knwo how this would effect the NO start and NO RPM?

Sebambam

Holley checked the ECU and declared it as good

I checked the 3 pin Crank sensor wiring and could confirm 12V + so no breaks there